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PTs with the MONITOR Button
PTs with the MONITOR button can dial in hands-free mode but cannot have hands-free conversations.

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Hands-free mode is cancelled if an extension user does not start dialling within 10 seconds.

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This feature can be used by pressing the following buttons when the indicator of the SP-PHONE/MONITOR button is off:

–	SP-PHONE button
–	MONITOR button
–	INTERCOM button
–	CO button

•	To monitor using this feature, an extension must have a PT with an AUTO ANS/MUTE button or a single line telephone (SLT) with a MUTE button. To be monitored using this feature, an extension must have a PT with an AUTO ANS/MUTE button.
•	System programming determines the extensions that can be monitored using this feature ( Room Monitor [612]).
•	A doorphone access tone will be sent to a monitored doorphone before monitoring starts ( 1.15.1 Doorphone Call). If an extension user wants to monitor a doorphone without informing the other party, it is possible to eliminate the tone through system programming ( Doorphone Access Tone [707]).
•	Access tones will not be sent to a monitored PT. Paging tones will also not be received by a monitored PT.

During a conversation, a proprietary telephone (PT) user can disable the built-in microphone to consult privately with others in the room while listening to the other party on the phone through the built-in speaker. When Microphone Mute is active, the user can hear the other party's voice, but the user's voice is muted.

•	This feature is only available on PTs that have an AUTO ANS/MUTE button.

This PBX supports headset-compatible proprietary telephones (PTs). A PT user can talk to another party without lifting the handset by using an optional headset.
For connection and operation, refer to the Operating Instructions for the headset.

This feature is also known as Handset/Headset Selection.

•	Headset users cannot use the Automatic Redial feature ( 1.6.1.4 Redial ).
•	To set headset mode on a PT, use the handset/headset selector located on the telephone and/or on the headset.
•	If headset mode is on, pressing the SP-PHONE button activates the headset, not the built- in speaker.

Once Data Line Security is set on an extension, communication between the extension and the other party is protected from signals such as Call Waiting, Hold Recall, and Executive Busy Override. Extensions that have devices such as modems, fax machines, or Voice Processing Systems (VPSs) connected to them may set this feature to maintain secure data transmission, by blocking tones or other interruptions during communication.

A proprietary telephone (PT) user can use the FLASH/RECALL button to disconnect the current call and start another call without hanging up. For example, if this button is used to disconnect an outside (CO) line, the extension user will hear a new dial tone from the same outside (CO) line.

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FLASH/RECALL Button Mode
One of the following modes can be selected through system programming (

Flash/Recall Key Mode [110]):

a)	MODE 1: EFA mode ( 1.10.7 External Feature Access (EFA)) An EFA signal is sent for the specified duration ( Flash/Recall Time [418]).
b)	MODE 2: Flash/Recall mode A flash/recall signal is sent when the FLASH/RECALL button is pressed if the length of time that the button is pressed is longer than the specified duration ( Flash/Recall Time [418]). If the length of time that the button is pressed is shorter than the specified duration, an EFA signal will be sent for the specified duration.

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This feature functions only if the FLASH/RECALL button is set to "MODE 2: Flash/Recall mode".

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Disconnect Time
The amount of time between successive accesses to the same outside (CO) line is programmable for each outside (CO) line (

Disconnect Time [422]).

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This feature generates an SMDR call record (

1.20.1 Station Message Detail Recording (SMDR)) and restarts the call timer. The notation "F/" will be logged along with the new dial number.

An extension user can access features of a host PBX or the telephone company, such as Call Waiting. An EFA (External Feature Access) signal is sent to the host PBX or the telephone company. This is only available on outside (CO) line calls, including Host PBX Access (

1.5.2.7 Host PBX Access Code (Access Code to the Telephone Company from a Host PBX)).

•	This feature functions only if the FLASH/RECALL button is set to "MODE 1: EFA mode" ( 1.10.6 Flash/Recall). It is also possible to perform this feature by entering the EFA feature number when the current call is placed on consultation hold ( 1.12.5 Consultation Hold).
•	Flash/Recall Time The length of an EFA signal can be selected for each outside (CO) line ( Flash/Recall Time [418]).

Outside (CO) line calls are limited by the following features:

Feature

Description

Extension-to-Outside (CO) Line Call Duration

When a call between an extension user and an outside party is established, the call duration is restricted by a timer (

Extension-to-CO Line Call Duration [212]). Both parties will hear a warning tone at 5-second intervals 15 seconds before the timer expires. When the timer expires, the call is disconnected. System programming determines which extensions have calls limited by this feature (

CO Line Call Duration Limitation [613]). This timer applies to outside (CO) line calls that are made via the PBX.

Outside-to-Outside (CO-to-CO) Line Call Duration

When a call between 2 outside parties is established, the call duration is restricted by a timer (

CO-to-CO Line Call Duration [205]). Both parties will hear a warning tone 15 seconds before the timer expires. When the timer expires, the call is disconnected.

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Lockout
If one party in a conversation goes on-hook, the call between both parties will be disconnected. A reorder tone is sent to the off-hook party before the call is disconnected. No operation is necessary.

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When an extension user seizes an outside (CO) line and then transfers the call to another extension user who can use this feature, the Extension-to-Outside (CO) Line Call Duration timer starts after the transferred call is answered by the outside party.

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The Outside-to-Outside (CO-to-CO) Line Call Duration feature applies to the following calls:

–	Calls forwarded by the FWD to Outside (CO) Line feature ( 1.3.1.2 Call Forwarding (FWD))
–	Calls transferred by the Call Transfer to Outside (CO) Line feature ( 1.11.1 Call Transfer)
–	Calls using the DISA feature ( 1.15.6 Direct Inward System Access (DISA))
–	Calls using the Unattended Conference feature ( 1.13.1.2 Conference)

Any proprietary telephone (PT) can be connected in parallel with a single line device, such as a single line telephone (SLT), fax machine, or modem.
When parallel mode is used, the 2 telephones function as follows:

•	Both share one extension number.
•	Either telephone or device can make or answer calls.

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System programming determines the SLTs that can be connected in parallel with a PT (

Parallelled Telephone [610]).

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When the SLT is in operation, the display and LED (Light Emitting Diode) indicator on the paired PT will function in the same way as when the PT is in operation.

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The following features cannot be used with an SLT connected in parallel with a PT:

–	Call Splitting
–	Conference
–	Door Open while connected to the doorphone
–	External Feature Access (EFA)
–	Hot Line

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An SLT connected in parallel with a PT will not ring if the PT is:

–	In Hands-free Answerback mode ( 1.4.1.4 Hands-free Answerback).
–	In Voice-calling mode (Alternate Receiving—Ring/Voice) ( 1.5.1.1 Intercom Call).

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An extension user cannot make a call from the SLT if the PT is:

–	Playing background music (BGM)
–	Receiving a paging announcement over the built-in speaker
–	In programming mode

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Both the PT and the SLT will ring for incoming calls (if the ringer is turned on).

A CPC (Calling Party Control) signal is an on-hook indication (disconnect signal) sent from an outside (CO) line when the other party hangs up. To maintain efficient utilisation of outside (CO) lines, the PBX monitors each line's status and when a CPC signal is detected on a line, the PBX disconnects the line and alerts the extension with a reorder tone.

•	CPC Signal Detection is programmable for incoming outside (CO) line calls ( CPC Signal Detection—Incoming [420]) and for outgoing outside (CO) line calls ( CPC Signal Detection—Outgoing [421]).
•	If a CPC signal is detected during a call between a caller using the DISA feature ( 1.15.6 Direct Inward System Access (DISA)) and an extension or an outside party, the call will be disconnected.
•	It is possible to select whether the PBX detects the reverse signal from incoming outside (CO) line calls for the duration ( CPC Signal Detection—Incoming [420]) specified through system programming ( Incoming Reverse [153]).